CN102573203A - Current Leakage Protection Device for LED Applications - Google Patents

Current Leakage Protection Device for LED Applications Download PDF

Info

Publication number
CN102573203A
CN102573203A CN2011103066789A CN201110306678A CN102573203A CN 102573203 A CN102573203 A CN 102573203A CN 2011103066789 A CN2011103066789 A CN 2011103066789A CN 201110306678 A CN201110306678 A CN 201110306678A CN 102573203 A CN102573203 A CN 102573203A
Authority
CN
China
Prior art keywords
electronic circuit
current
driver
led
circuit according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2011103066789A
Other languages
Chinese (zh)
Inventor
陈祖盛
何铭泰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
XIRONG CO Ltd
Original Assignee
XIRONG CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by XIRONG CO Ltd filed Critical XIRONG CO Ltd
Publication of CN102573203A publication Critical patent/CN102573203A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B31/00—Electric arc lamps
    • H05B31/48—Electric arc lamps having more than two electrodes
    • H05B31/50—Electric arc lamps having more than two electrodes specially adapted for ac
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/26—Circuit arrangements for protecting against earth faults
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/385—Switched mode power supply [SMPS] using flyback topology
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Abstract

The present invention relates to an electronic circuit for driving an LED device which includes an LED, a driver for supply current to the LED array, and one or two current detection modules connected to one or both ends of the LED array for detecting current level and sending signals about the current level detected to the driver, wherein the drive will break the circuit immediately upon detecting a fault condition on either side of the LED array based on the feedback from one or both current detection modules.

Description

Be used for the earth leakage protective device that LED uses
Technical field
The present invention relates to a kind of earth leakage protective device or circuit breaker.More particularly, the present invention relates to earth leakage protective device or the circuit breaker that a kind of LED of being used for uses.
Background technology
LED illumination engine becomes in vogue day by day in recent years.LED illumination engine not only provides the longer life-span, and with low-power consumption work, has both saved energy, also more environmental protection.LED can be applied in a lot of fields, for example comprises decorative lighting, safety system and the existing light source of replacement such as fluorescent lamp and Halogen lamp LED of general lighting, indoor and outdoors.
In order to be increased in the LED brightness (1m/W) under the equal-wattage, there has been increasing research to carry out, and proposed many drive schemes simultaneously.Yet the concern of the secure context that LED is used is less relatively.In actual use; Except the existing general secure authentication testing that is suitable for (this test must need complicated integrated manipulator and/or sensing module or element); For using, LED do not design specially; Simple but can guarantee safety test or the measure that LED product under any circumstance can not damage the user, particularly be used for replacing when having the product that infrastructure uses now when the LED product.A good example is to use LED pipe (array) to replace fluorescent tube.Therefore, need a kind of new earth leakage protective device that is exclusively used in the LED application of exploitation on the reality.
Summary of the invention
According to an aspect of the present invention, a kind of electronic circuit is provided, said electronic circuit comprises: (a) have two ends and comprise the led array of at least one LED; (b) be used for driver to said led array supply of current; (c) be connected to first current detection module of the end in the said two ends, said first current detection module is used to detect levels of current and detected signal based on said levels of current is sent to said driver.
According to an execution mode, said driver comprises logical block, and said logical block can stop supply of electrical energy when said first current detection module receives certain signal.
According to an execution mode; Said electronic circuit also comprises second current detection module of the other end that is connected in the said two ends, and said second current detection module can detect levels of current and can detected signal based on said levels of current be sent to said driver.
According to an execution mode, whether said driver stops supply of electrical energy according to the signal deciding that receives from said first current detection module and said second current detection module respectively.
In one embodiment, said electronic circuit is the buck topology structure.
In one embodiment, said electronic circuit is instead to swash topological structure.
In one embodiment, said electronic circuit is the forward converter topological structure.
In one embodiment, said driver is a switching mode.
In one embodiment, said driver is non-switching mode.
In one embodiment, said driver is a Linear actuator.
In one embodiment, said led array and power network are isolated.
In one embodiment, said led array is not isolated with power network.
In accompanying claims, specifically illustrate and characterize various novel features of the present invention, these claims form this disclosed part.In order to understand the present invention, service advantages of the present invention and specific purposes that the application of the invention reached better, will be with reference to accompanying drawing and following explanation, wherein accompanying drawing has been described preferred implementation of the present invention with following explanation diagram.
Description of drawings
Fig. 1 has depicted the general structure of the led array that utilizes breaker protection of the present invention, and said circuit breaker has the single-point current sense configuration.
Fig. 2 has depicted the circuit breaker with 2 current sense configuration of the present invention.
Fig. 3 has depicted exemplary boosting (supercharging) circuit topological structure of driving LED, and said circuit topological structure has adopted the circuit breaker with 2 current sense configuration of the present invention.
Employed when Fig. 4 has depicted with led array replacement fluorescent tube, have the circuit of circuit breaker of the present invention.
Fig. 5 has depicted the waveform that is illustrated in trigger protection when electric leakage takes place, and Ch1 is the LED electric current, and Ch2 is the VCC voltage of APFC IC U1.
Embodiment
Fig. 1 has depicted the basic structure of the led array of the breaker protection that utilizes made of the present invention.This circuit breaker comprises current measuring element and driver.In this embodiment, AC-input voltage changes direct current into through after the bridge rectifier, and then passes through drive circuit.Driver is with the led array of power delivery to common employing constant current configuration.The electric current that flows through LED is controlled through receiving control signal from current measuring element/module.Said current measuring element/module is continuously monitored LED electric current and common and led array arranged in tandem.If driver is according to confirming that from the signal of current detection module system is under the fault condition, it will stop power delivery and circuit will be broken off.Employed driver and current measuring element or module all are traditional design, and are known for a person skilled in the art.And select suitable driver and current detection module to adapt to concrete application of the present invention also is within one skilled in the relevant art's ability.
Fig. 2 has shown another embodiment of the invention, and wherein circuit breaker has 2 current sense configuration.In some real-life situations, for example when replacement LED when pipe, the execution mode shown in Fig. 1 maybe be not enough, because its fault condition a bit of detection arrays only, but any end that may contact tube when the user replaces the LED pipe.If the other end at array breaks down, driver possibly not known this situation and is continued supply of electrical energy, thereby circuit and/or user are caused damage.Therefore, the design that is characterized as the execution mode of 2 current sense configuration of the present invention can be used for overcoming the difficulty that is run under the situation such as above-mentioned.Two forms or the identical or different current detection module of circuit structure have been used at the two ends of led array.Logical block in the driver receives signal from two detection modules, and only when two detectors are all passed the signal of reflection normal operating condition back, just allows supply of electrical energy.Can guarantee that like this supply of electrical energy all will stop when the either side of led array is in fault condition, with protection LED matrix and user.Equally, employed driver and current measuring element or module all are traditional designs, and are known for a person skilled in the art.And select suitable driver and current detection module to adapt within the ability that specifically is applied in those of ordinary skill in the art of the present invention.
Fig. 3 is a typical case who is used for the driving LED array (supercharging) circuit that boosts, and this circuit adopts 2 current detecting circuit breakers of the present invention as safety measure.This circuit topological structure can be widely used in a large amount of LED coupled in series arrays, so that its total forward voltage is higher than the situation of input voltage.Thereby input voltage must be pressurized to more high voltage to light LED.The LED electric current is by sensing and fed back to PWM (pulse-width modulation) controller, thereby holding current is constant.The PWM controller also receives information from alternating voltage and causes power factor correction to reach.Current detection module A and B monitoring flow into and flow out the electric current of led array, and current information is fed back to the PWM controller, and this PWM controller stops electric energy transmitting immediately when detecting fault condition, promptly cut off the supply of electrical energy of circuit.In this case, the effect of PWM controller also becomes the logical block that comprises circuit breaker of the present invention.
Fig. 4 has depicted and with led array replacement fluorescent tube the time, has used actual execution mode of the present invention.This led array comprises 140 LED, and the total forward voltage of typical case is 460V." LH " and " LT " is that the user possibly touch in actual life, leakage current possibly take place and place that the user is damaged.PWM controller U1 is APFC (APFC) IC that on market, can buy easily, such as ST L6562.Boost pressure circuit is made up of elements T 1, Q2 and D3.T1 is an inductor.Q2 is N-channel MOS FET, and D3 is Ultrafast recovery diode or silicon carbide diode.All these elements or equal and alternative material can easily have been bought on market.Q2 is by APFC IC U1 control opening and closing (switch).AC-input voltage is converted into relative constant DC and presses, and is kept by capacitor C2 and C3.
When the output voltage on C2 and the C3 during greater than total forward voltage of led array, LED will be lighted.Because the characteristic of LED, this voltage will be retained as constant relatively.The electric current that flows through LED is monitored by resistor R 12, and utilizes feedback network resistor R 10 and R11 and capacitor C4 to regulate by APFC IC U1.In this embodiment, the LED electric current remains on 50mA.Resistor R 1, R2, R3, NPN triode Q1 and Zener diode ZD1 have formed the startup module, to the voltage VCC of APFC IC U1 electric energy are provided, thus start-up circuit.Afterwards, APFC IC U1 is by the power module supply, and said power module is made up of resistor R 7, R8, diode D1, D2 and capacitor C1.In this embodiment, the VCC voltage of APFC IC U1 remains on 15V relatively consistently.Resistor R 4, R5, R6 provide necessary AC information to APFC IC U1, to make the APFC normal running.
First current detection module is formed by resistor R 9, PD1 and PD2.PD1 and PD2 are the parts of optical coupler.In this embodiment, said optical coupler is PC817.If " LH " leaks electricity at point, then electric current will flow through PD1 and thereby unlatching PD2.If electric current correctly flows through LED and also flows through R12, then will be unlocked for the NPN triode Q3 of MMBT2222A in this embodiment.If " LT " leaks electricity at point, Q3 will be cut off.Therefore, PD1-PD2-Q3 has formed logical, and to guarantee having only when when two test points all electric leakage do not take place, the voltage of point " VS " just is low.U2 is comparator IC, and in this embodiment, this comparator IC is TS321, and under the situation of the condition of breaking down, the output voltage of U2 will be a logic high, thereby voltage Vb will be greater than 2.5V.As voltage Vb during greater than 2.5V, APFC IC U1 is under an embargo, and therefore not having any electric energy can transfer to the LED side from input.
If become at any one LED under the situation of open circuit, output voltage can not automatically keep constant and rise continuously.In order not damage to the user, output voltage is by resistance R 13, R14 and R15 monitoring.If output voltage surpasses predetermined value (in this embodiment, this predetermined value is 500V), Zener diode ZD2 will trigger thyristor X, and cause the VCC voltage of APFC IC U1 to become zero.This will make APFC IC U1 quit work.As long as output voltage is higher than predetermined value, circuit just keeps breaking off.
Fig. 5 has depicted the waveform that is illustrated in trigger protection when electric leakage takes place.Before electric leakage, LED electric current (Ch1) suitably remains on 50mA consistently, and the VCC voltage of APFC IC U1 remains on 15V (Ch2).Through according to the guiding of the test program of safety standard (for example UL 935), when circuit operation, 500 ohm resistor is connected to point " LH " and simulates electric leakage.After electric leakage, the VCC voltage of LED electric current and APFC ICU1 all becomes zero.Electric energy transmitting stops immediately.
It will be understood by those skilled in the art that the circuit protection device like above enforcement can be applicable to other circuit topological structures, such as buck converter, anti exciting converter, forward converter etc.Led array and power network are isolated or are not isolated all and can use.In addition, said driver needs not to be switching mode, and the other types such as Linear actuator also can adopt this protective circuit breaker.
Although described and illustrated the basic novel feature that is applicable to its preferred implementation of the present invention; Be understood that; Under the situation that does not break away from spirit of the present invention, those skilled in the art can carry out various omissions, replacement and change to the form and the details of illustrated embodiment.The present invention does not receive the restriction of above-mentioned execution mode, and these execution modes only provide as an example, and in the protection range that accompanying claims limits, can make amendment in every way.

Claims (12)

1. electronic circuit, said electronic circuit comprises:
(a) have two ends and comprise the led array of at least one LED;
(b) be used for driver to said led array supply of current;
(c) be connected to first current detection module of the end in the said two ends, said first current detection module is used to detect levels of current and detected signal based on said levels of current is sent to said driver.
2. electronic circuit according to claim 1, wherein said driver comprises logical block, said logical block can stop supply of electrical energy when said first current detection module receives certain signal.
3. electronic circuit according to claim 1; Said electronic circuit also comprises second current detection module of the other end that is connected in the said two ends, and said second current detection module can detect levels of current and can detected signal based on said levels of current be sent to said driver.
4. electronic circuit according to claim 3, whether wherein said driver stops supply of electrical energy according to the signal deciding that receives from said first current detection module and said second current detection module respectively.
5. electronic circuit according to claim 1, wherein said electronic circuit are the buck topology structures.
6. electronic circuit according to claim 1, wherein said electronic circuit are instead to swash topological structure.
7. electronic circuit according to claim 1, wherein said electronic circuit are the forward converter topological structures.
8. electronic circuit according to claim 1, wherein said driver is a switching mode.
9. electronic circuit according to claim 1, wherein said driver are non-switching modes.
10. electronic circuit according to claim 9, wherein said driver is a Linear actuator.
11. electronic circuit according to claim 1, wherein said led array and power network are isolated.
12. electronic circuit according to claim 1, wherein said led array are not isolated with power network.
CN2011103066789A 2010-10-07 2011-10-08 Current Leakage Protection Device for LED Applications Pending CN102573203A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/899,561 2010-10-07
US12/899,561 US8400076B2 (en) 2010-10-07 2010-10-07 Current leakage protection device for LED applications

Publications (1)

Publication Number Publication Date
CN102573203A true CN102573203A (en) 2012-07-11

Family

ID=45924597

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011103066789A Pending CN102573203A (en) 2010-10-07 2011-10-08 Current Leakage Protection Device for LED Applications

Country Status (2)

Country Link
US (1) US8400076B2 (en)
CN (1) CN102573203A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102752937A (en) * 2012-07-16 2012-10-24 绍兴文理学院 Starting circuit in LED (light-emitting diode) driving chip
WO2014153794A1 (en) * 2013-03-29 2014-10-02 深圳市华星光电技术有限公司 Led backlight driving circuit and driving method thereof, and liquid crystal display device
CN104349529A (en) * 2013-07-26 2015-02-11 硕颉科技股份有限公司 Light emitting diode driving device and light emitting diode driving method
US9196202B2 (en) 2013-03-29 2015-11-24 Shenzhen China Star Optoelectronics Technology Co., Ltd. LED backlight driving circuit, LCD device, and method for driving the LED backlight driving circuit
CN109830932A (en) * 2017-02-17 2019-05-31 杰华特微电子（杭州）有限公司 Leakage protection circuit and illumination driving circuit

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8957601B2 (en) 2008-09-18 2015-02-17 Lumastream Canada Ulc Configurable LED driver/dimmer for solid state lighting applications
WO2013014580A1 (en) * 2011-07-22 2013-01-31 Koninklijke Philips Electronics N.V. Light emitting diode driver with non-destructive circuit for indicating fault or outage of light emitting diode load
JP2014186842A (en) * 2013-03-22 2014-10-02 Toshiba Lighting & Technology Corp Illumination baton
US9801252B2 (en) * 2013-06-27 2017-10-24 Philips Lighting Holding B.V. Retrofit light emitting diode tube
US9705306B2 (en) 2014-10-23 2017-07-11 Honeywell International Inc. Non-isolated power supply output chassis ground fault detection and protection system
CN105790212A (en) * 2016-04-27 2016-07-20 国网安徽省电力公司六安市叶集供电公司 Meter-box intelligent residual-current circuit breaker
WO2020082178A1 (en) 2018-10-26 2020-04-30 Lumastream Canada Ulc Inrush current limited ac/dc power converter apparatus and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101568217A (en) * 2009-05-25 2009-10-28 张文宏 Lamp tube power supply structure
CN201369862Y (en) * 2009-02-04 2009-12-23 北京朗波尔光电科技有限公司 LED constant current driver
CN201491339U (en) * 2009-08-20 2010-05-26 浙江光益光能科技有限公司 LED driving circuit
CN101815382A (en) * 2010-04-02 2010-08-25 上海小糸车灯有限公司 Step-down constant current LED drive circuit for automobile lighting
CN101842914A (en) * 2007-10-26 2010-09-22 松下电工株式会社 Light emitting diode drive device, illumination device, in-vehicle cabin illumination device, and vehicle illumination device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101245121B1 (en) * 2005-06-10 2013-03-25 에이저 시스템즈 엘엘시 Regulation of electrical current through a resistive load
US8106597B2 (en) * 2008-01-22 2012-01-31 Supertex, Inc. High efficiency boost LED driver with output
JP5592613B2 (en) * 2009-01-22 2014-09-17 パナソニック株式会社 Power supply device and lighting apparatus using the same
US8456106B2 (en) * 2009-04-14 2013-06-04 Supertex, Inc. LED driver with extended dimming range and method for achieving the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101842914A (en) * 2007-10-26 2010-09-22 松下电工株式会社 Light emitting diode drive device, illumination device, in-vehicle cabin illumination device, and vehicle illumination device
CN201369862Y (en) * 2009-02-04 2009-12-23 北京朗波尔光电科技有限公司 LED constant current driver
CN101568217A (en) * 2009-05-25 2009-10-28 张文宏 Lamp tube power supply structure
CN201491339U (en) * 2009-08-20 2010-05-26 浙江光益光能科技有限公司 LED driving circuit
CN101815382A (en) * 2010-04-02 2010-08-25 上海小糸车灯有限公司 Step-down constant current LED drive circuit for automobile lighting

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102752937A (en) * 2012-07-16 2012-10-24 绍兴文理学院 Starting circuit in LED (light-emitting diode) driving chip
WO2014153794A1 (en) * 2013-03-29 2014-10-02 深圳市华星光电技术有限公司 Led backlight driving circuit and driving method thereof, and liquid crystal display device
US9196202B2 (en) 2013-03-29 2015-11-24 Shenzhen China Star Optoelectronics Technology Co., Ltd. LED backlight driving circuit, LCD device, and method for driving the LED backlight driving circuit
CN104349529A (en) * 2013-07-26 2015-02-11 硕颉科技股份有限公司 Light emitting diode driving device and light emitting diode driving method
CN109830932A (en) * 2017-02-17 2019-05-31 杰华特微电子（杭州）有限公司 Leakage protection circuit and illumination driving circuit

Also Published As

Publication number Publication date
US8400076B2 (en) 2013-03-19
US20120086356A1 (en) 2012-04-12

Similar Documents

Publication Publication Date Title
CN102573203A (en) Current Leakage Protection Device for LED Applications
CN102333404B (en) Controller and system for controlling dimming of a LED light source
CN203027535U (en) LED lamp having self-diagnosis and remote monitoring function
CN102132479A (en) Power supply device and lighting device
CN102026436B (en) Led traffic signal with synchronized power pulse circuit
CN102348314B (en) Power supply device for LED lamp and LED lamp system
CN102548123A (en) Circuits and methods for driving light sources
CN102223749B (en) Inserted type multifunctional light emitting diode (LED) drive circuit
CN105075396A (en) Detection of a hazard condition of a load
TWM451466U (en) Power saving illuminating device with human sensing module
CN202713690U (en) Dimming interface circuit used for LED drive power
CN102450100B (en) Drive circuit for a LED
CN102510622A (en) LED (Light Emitting Diode) light tube driving circuit suitable for backup power supply fixture lamp
EP2373126A2 (en) Illumination system adaptable to a cooling appliance
CN101718408A (en) Airport pavement warning device
CN101516147A (en) LED driving system
CN109673075A (en) Aviation obstruction beacon
CN205546034U (en) MCU switch switches device of adjusting luminance
CN102182973B (en) Emergency lighting integrated LED (light emitting diode) lamp fixture
CN202496102U (en) Emergency lamp with self-checking function
CN202310225U (en) LED lamp tube driving circuit applicable to bracket lamp with backup power supply
CN102428753B (en) Driver circuit for an led
CN202127529U (en) Emergency lighting integrated light-emitting diode (LED) lamp
CN201805595U (en) Intelligent light-emitting diode (LED) emergency lamp control circuit
CN103796373A (en) Light-emitting diode illumination system with clamping device

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20120711